William dana ewaet



(Model.)

W.QD. EVM-RT.v

DRIVE CHAIN.'- y

Patented Apr. 22, 1884.

1 IWEAITOF.

HHI

Hill

UNITED STATES PATENT OFFICE.

WILLIAM DANA' EW'ART, OF CHICAGO, ILLINOIS, ASSIGNORTO THE EW'ART MANUFACTURING COMPANY, OF SAME PLACE.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 297,362, datedApril 22, 1884.

(Model.)

To all whom it may concern.`

Be it known that I, WILLIAM DANA EWART, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drive-Chains; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, Inaking part of this application.

My invention relates more particularly to certain new and useful improvements in that species of drive-chains each link of which is composed of two separate side bars, connected at two of their opposite ends by a removable pintle-like bar, which passes through bosses projecting inwardly from said ends of the side bars, andwhich engage at their opposite ends in `a detachable manner with the pintle-like bar of the next adjacent link; and my invention has for its object, among other things, to improve this species of chain when it has combined with it roller-like devices for lessening the friction between the chain and any surface on which the chain may have'to drag; also to render the bearings for the pintle-Pike bars capable of wearing longer with the same amount of stock; also to strengthen the chain without increasing its weight at those points where the detachable ends of the side bars draw or pull upon the end portions of the pintle-like bars. To these main ends and objects my inventiouconsists in the novel devices and combi nations of devices, which will be hereinafter more fully explained, and which will be most particularly pointed out in the claims of this specification.

To enable those skilled in the art to which my invention relates make and use the same,- I will now proceed to more fully describe it, referring by letters of reference to the accompanying drawings, in which I have illustrated a chain in which I have carried out the several features of my invention in that form which is the best now known to me, and in which I have so far practiced my invention.

In the accompanying drawings, which form part of this specification, Figure lis a top or face view of the chain made according'to my invention. Fig. 2 is an edge view of the same. Fig. 3 is a detail Vertical section at the line a: n: of Fig. l. Fig. 4 is a vertical cross-section at the line y y ot'FigL 1. Fig. 5 is a per. spective viewof one of the side bars detached. Fig. 6 is a similar view ofone ofthe pintle-like 55 end bars, and Fig. 7 is a similar view of the anti-friction rollers; and in these several figures the same part will be found kdesignated by the same letter of reference.`

A represents the side bars of the chain, and, as seen, are duplicates, as are also the pintlelike devices B and the anti-friction rollers C. Each of the side bars is formed at one end with an inwardly-projecting boss, E, through which there is a hole arranged eccentrically and ofthe proper diameter to permit the insertion within it of the cylindrically-shaped pintle-like end bar, B,while at the opposite end of each side bar, A, there is formed an oblong hole, obstructed, however, during a portion of its length by centrally-arranged feathers or projections, a, so that only a key-shaped de vice could be passed clean through the hole at this end of the bar. Each pintle-like end bar, B, has near each end two opposite par- 7 allel seats or recesses, e, of a width such as to accommodate the rib-like projections a, in a manner to be presently explained, when the parts of the chain are put together, and are in a working condition. At G, on each 8O of theside bars, A, is formed, by a rib-like device, a stop or projection against which the opposite end of the next adjacent side bar may abut to prevent any disengagement of the links when the parts are coupled together in a working condition. Each of the anti-friction rollers C is formed, as shown, Withthe interior bore or bearing-surface of a size adapt` ed to lit the pintle B, and with an overhanging periphery, so to speak, which extends over, although it does not come in contact with the external 'surface of the'bosses of the side bars, the periphery of the roller C being thus about equal in length to the entire distance between the inner faces of the side bars of the link, while its bearingsurface on the pintle B is less than half of this length. By this construction and arrangement of the antifriction rollers C, I get a roller which, while it has a comparatively short journal surface or Ioo I bearing, has a comparatively long periphery or surface where it rolls on the surface upon e Y j 297.362

which the chain may have to drag. By making the holes or bores through the bosses of the side bars eccentric. as shown, these bosses will be capable of wearing longer without adding anything to the weight of the chain, since by such eccentric arrangement of the holes, the greater portion of the stock composing the boss is arranged at the locality where the journal will cut or wear away the stock of the boss, and comparatively little stock is left at that portion ofthe boss which is not subjected 'to any strain or Wear. By forming the pintle B with the recesses or notches e, located as shown, and by placing the ribs or feathers a' centrally within the perforated portions of the end bars, A, I am enabled, it will be seen, to

get a bearing for the pulling strain of each end bar on each end ot' the pintle at points where the latter is not weakened by the cuttingof the recesses, and at t-hesame time have the construction of the chain such that the pintle-like devices do not project at their ends beyond the exterior faces vof the side bars. All these peculiarities of construction I consider of importance and advantage in the kind A ot' chain shown and described.

Vturned upto be moved laterally' off of the ends 'of the pintle-like device, very much after the fashion of uncoupling the parts ot' this species of detachable chain as heretofore made, and as shown invpatents prior to my invention.

In the use of a chain made according to my invention, while all the parts are duplicates and can be easily taken apartand put together when desired, though not liable to ac cidental detachment, the anti-frictiourollers will work easier and better, thev bearings in the bosses on the pintle-like devices will wear better and last longer, and the chain will be stronger at the points where the draft-strain of the side bars comes on the end portion of thepintle-likev devices.

Of course, I do not propose to restrict my invention to the precise sizes and proportions of the parts, the details of construction being capable of modification without changing the principle of construction or the inode of operation.

What I claim as new, and desire to secure by Letters Patent, is-

1. In combination with the side bars provided with inwardly-projecting bosses (to get a large weaiingsurl'ace on the pintle) and the pintle-like end bars, anti-friction rollers which bear and'run upon the pintle-like devices or end bars, and which have overhanging peripheries covering the boss-like devices, all substantially as and for the purposes set forth.

2. A drive-chain the side bars of which have inwardly-projecting bosses adapted to work. on a pintle-like end bar, said bosses having apertures or holes for the pintle formed eceenrrically to the cylindrical contour of the bosses, substantially as and for the purposes set forth.

3. In combination with the side bars of a link, a pintle-like removable end bar having notches or recesses e, the oblong openings in two ends of said side bars provided with cen.` trallyarranged feathers or ribs, a, adapted to engage'with the recesses of the pintle of an adjacent link in such manner as to afford a bearing for the pulling strain on the unmutilated portion of the saidspintle-like end bar7 substantially as set forth.

In testimony whereof I have hereunto set my hand this 21st day of February. 1884.

' WVILLIAM DANA EWART. In presence of- JACOB FELBEL, EDW. BLEEZARD. 

